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Knowledge
Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
What is the definition of an atom?
Answer: The smallest unit of an element.
Hint: Think about the smallest piece of matter.
💡 Hint: Think about the smallest piece of matter.
Question 2
Easy
Can an atom exist independently?
Answer: No, it often combines to form molecules.
Hint: Consider what happens in a chemical reaction.
💡 Hint: Consider what happens in a chemical reaction.
Practice 4 more questions and get performance evaluation
Interactive Quizzes
Engage in quick quizzes to reinforce what you've learned and check your comprehension.
Question 1
What does the law of conservation of mass state?
Type: MCQ
Options:
- Mass can be created in reactions
- Mass cannot be created or destroyed
- Mass changes in chemical processes
Correct Answer: Mass cannot be created or destroyed
Explanation: This law ensures that the mass of reactants equals the mass of products.
Hint: Think about chemical reactions.
- - Mass can be created in reactions - Mass cannot be created or destroyed - Mass changes in chemical processes **Correct Answer**: Mass cannot be created or destroyed **Explanation**: This law ensures that the mass of reactants equals the mass of products. **Hint**: Think about chemical reactions.
💡 Hint: Think about chemical reactions.
Question 2
True or False: All atoms of a given element are identical.
Type: Boolean
Options:
- True
- False
Correct Answer: True
Explanation: According to Dalton's theory, atoms of an element have identical mass and properties.
Hint: Recall Dalton's postulates.
- - True - False **Correct Answer**: True **Explanation**: According to Dalton's theory
- atoms of an element have identical mass and properties. **Hint**: Recall Dalton's postulates.
💡 Hint: Recall Dalton's postulates.
Solve and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
If 10g of substance A reacts with 15g of substance B, what will be the mass of the products?
Solution: According to the law of conservation of mass, the mass of products will be 25g (10g + 15g).
Hint: Add the masses of the reactants together.
💡 Hint: Add the masses of the reactants together.
Question 2
According to Dalton's atomic theory, how do atoms combine to form compounds?
Solution: Atoms combine in fixed, whole-number ratios, showing the ratios of elements in compounds.
Hint: Think about how 'friends' combine to form a 'team' in specific numbers.
💡 Hint: Think about how 'friends' combine to form a 'team' in specific numbers.
Challenge and get performance evaluation